Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca98300babececcb…

MALICIOUS

PDF

67.5 KB Created: 2021-09-23 13:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f965e07d8864578f0d00204c875eae2 SHA-1: f88d177df4140efe14d3386afe01d40b5a1024fc SHA-256: ca98300babececcb318589012a0c66f4028c77d726a820afe6c2c503a77d9872
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable elements. It contains numerous external URIs, including one pointing to 'pistant.ru', suggesting a redirection mechanism to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=can+you+still+play+fortnite+on+android PDF link annotation
    • http://guides2alpes.org/uploads/file/68250796626.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/66946000787.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wuzedezubegudijinujeg.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/54276562645.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/779c0cec817806797d5440d67ca29cc6/93367541504.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bf251f53b2dae790a17072418fc45068/49479656191.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/womudepugekufipopipitevu.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/tomadejag.pdfIn PDF document text
    • http://chemicalengineers.ie/images/radowekazepuvet.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/konizedizomixa.pdfIn PDF document text
    • http://bociany.sk/media/file/62234175684.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/metosanezoz.pdfIn PDF document text
    • https://digireg.com/upload/90165827472.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kerutiginezonujaduduwa.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/mejakoxedogebefok.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/58108338025.pdfIn PDF document text
    • http://neteyes.eu/editor_up/8498048664.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/mokozib.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/vudenadelomujupedevoraxix.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/81278449052.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 14028 bytes
SHA-256: eb3de295170b9e6dc0cee353b38f1fcc0624aa318214bdfa35b6c5d298f0789c
font_02_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 10736 bytes
SHA-256: 32440c7fe1f64e3c5115dd9847488bbb9db83d1bbdcba2aa3975350c96a461ec

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